7.16. Raise Layer

The Raise Layer command raises the active
layer one position in the layer stack. If the active layer is
already at the top or if there is only one layer, this menu entry is
insensitive and grayed out. If the active layer is at the bottom of the
stack and it does not have an alpha channel, it cannot be raised until
you add an alpha channel to it.

7.16.1. Activating the Command

You can access this command from the image menubar through
Layer → Stack → Raise Layer,

or by clicking on the up-arrow icon at the bottom of the Layers
dialog.